sistems register2 - fundamentals

function solve(input) {
    let register = {};
    for (let line of input) {
        let [systemName, componentName, subcomponentName] = line.split(' | ');
        if (!register.hasOwnProperty(systemName)) {
            register[systemName] = {};
        }
        if (!register[systemName].hasOwnProperty(componentName)) {
            register[systemName][componentName] = [];
        }
        register[systemName][componentName].push(subcomponentName);
    }
    let sortedKeys = Object.keys(register).sort((a, b) => Object.keys(register[b]).length - Object.keys(register[a]).length || a.localeCompare(b));
    sortedKeys.forEach((key) => {
        console.log(key);
        let sortedSubKeys = Object.keys(register[key]).sort((a, b) => Object.keys(register[key][b]).length - Object.keys(register[key][a]).length);
        sortedSubKeys.forEach((subKey) => {
            console.log(`|||${subKey}`);
            register[key][subKey].forEach((subComponent) => {
                console.log(`||||||${subComponent}`);
            });
        });
    });
}